Rotary disk cutter



Oct. 28, 1952 G. PAROVEL ROTARY DISK CUTTER 2 SHEETS-SHEET 1 Filed Jan. 30. 1948 INVENTOR Giovanni Parouel ATTORNEYS Oct. 28, 1952 e. PAROVEL ROTARY DISK CUTTER 2 SHEETS-SHEET 2 F iled Jan. so, 1948 INVENTOR Giovanni Parovel ATTORNEYS Patented Oct. 28, 1952 1:

UNITED STATES" [PATENT OFFICE l ROTARY DISK C T Giovanni Parovel, Sacramento,-Calit. Application J amiary 30, 1948, Serial No. 5,339

a bowling alley finishing machine which includes a novel rotary scraper assembly adapted to work on the alley to level the'same with advance'of the machine therealong; the machine being supported and guided by rails temporarily mounted in the gutters alongside the alley.

An additional object of the invention is to provide a machine, as above, wherein the rotary scraper assembly includes a pair of vertical axis, rotary scrapers mounted in side by side relation, and having projecting blades whose paths lap, to the end that no portion of the alley is skipped between such rotary scrapers. The invention also provides an effective mount and drive for the rotary scrapers.

A further object of the invention is-to provide a bowling alley finishing machine which comprises, in combination, a rotary scraper assembly, and a powered sanding drum; such instrumentalities cooperating to accurately level and finish the surface of bowling alleys.

a practical and reliable bowling alley finishing machine, and one which will be exceedingly effective for the purpose for which it isv designed.

These objects are accomplished by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claim.

In the drawings:

Fig. 1 is a side elevation of the improved bowling alley finishing machine.

Fig. 2 is a cross section on line 2--2 of Fig. 1.

Fig. 3 is an enlarged fragmentary, sectional elevation of one of the rotary scrapers including itsmount and drive. I

Fig. 4 is a fragmentary sectional plan view illustrating the relative positions of the rotary scraper assembly, and the sanding drum.

Referring now more particularly to'the characters of reference on the drawings, the machine comprises a rigid housing I which forms the main frame of the machine; such housing being open at thebottom and including side plates 2 and a top plate 3, the latter being rounded down at opposite ends of the machine to complete the housing. enclosure.

The housing I is supported, for longitudinal travel, by a pair of transversely spaced wheels 4 at one end of the housing, and another pair of transversely spaced wheels 5 at the opposite end of the-housing; all of said wheels, in the present 1 Claim. (Cl. 144--219) each of which is indicated generally at ll.

".25 A further object of the invention is to produce,

2 embodiment, being flanged, as shown, and for the purpose hereinafter described.

The machine is adapted to travel lengthwise of a bowling alley A above the surface thereof, and such machine is supported and guided on rails 6 temporarily mounted in the gutters I. The rails 6 are'carried on longitudinally spaced suspension brackets 8 whichrun out of the troughs, and include an adjustment screw 9 which'bears on a adjustment of the screws 9 the'rails 6 canboth be set exactly level; said rails 6 then supporting the machine for travel likewise in a level path. The flange'wheels 4 and 5 ride the rails 6 in the manner illustrated in Figs. 1 and 2.

Between the wheels 4 and 5 the machine carries a pair of transversely spaced, rotary scrapers, As the rotary scrapers I l are each of identical construction, a description of one will suflice for both. I

Each rotary'scraper l I comprises a horizontal, vertical axis-spinner [2 which includes a hub l3, spider legs l4,vand a peripheral band [5. At circumferentially spaced points, here apart, the spinner I2 is radially slotted, as at 16, with said slots opening downwardly and outwardly. A- flat blade I! is engaged in each slot H5 in a vertically disposed, radially extending position; each blade being releasably retained in its slot by an inner end projection l8 seating in a corresponding socket 19. Additionally, a set screw 20 is threaded through the peripheral band l5 diagonally to bear against each blade to hold it in place.

The blades I! have a straight horizontal lower cutting edge 2|,and said blades are of a length so that they projectsomewhat beyond the peripheral band l5., I

A sleeve 22 is fixed in connection with the hub .I3' and projects vertically'upwardly therefrom;

being slidably splined to aspindle 23 which depends into said sleeve from above. The sleeve 22 runs through a bearing 24 on a cross bar 24a,

which cross bar is diagonally braced, as shown.

The spindle 23 works in a bearing 25 secured to the top plate 3.

The spindle 23 is driven, in the manner hereinafter described, in order to impart rotation to the spinner [2; the latter being vertically adjustable by means of a lifting fork unit 26 secured to the upper end of the sleeve'22, said unit including a radial lever 21 extending from a cross shaft 28 in the housing I. The cross shaft 28 carries the lifting fork units 26 for both rotary scrapers II, and said cross shaft is adjustable by an external extends between said gear drum spindles 42.

The spindles 23 are each fitted at their upper 4 ends, and above the top plate 3, with a bevel pinion 33; said bevel pinions being driven by bevel gears 34 on a transverse drive shaft 35. The

transverse drive shaft 35 is poweredfrom an elec-- tric motor 36 by means of anendless drive 31, which drive is here in the form of an endless belt and pulley unit.

The drive shaft 35, inaddition to driving the spindles 23, is extended and actuatesa reversing gear box 38. From the reversing gear box 38, which includes a control lever 39, an endless drive 49, here in the form of an endless belt and pulley unit, powers one of the wheels 4, whereby the machine is self-propelled along the rails 6, but at relatively low speed.

Between thewheels and the assembly of the rotary scrapers H, the machine includes a transversely extending sanding drum 4!,whose spindles 42 are carried at opposite ends in springsuspended, but vertically adjustable, slide blocks 43. The slide blocks 43 each run in a rectangular supporting frame 44, with heavy-duty springs 45 above and below said block; An upstanding adjustment screw 46 works against the uppermost spring for the purpose of adjusting each block 43. By adjustment of the blocks 43 not only --can the sanding drum 6| be leveled, but its pressure against the fioor can be'eiiectively regulated.

The sanding drum 4! is driven from the reversing gear box 38 by an endless drive 47, here in the form of an endless belt and pulley unit which box and one of the 1 When the machine is in operation, it is selfpropelled along the bowling alley A from end to end thereof; the rotary scrapers H working to level the surface of the alley, and the sanding drum 4i acting to impart a fine finish thereto.

The diameter of the rotary scrapers H is such that they work slightly more than a transverse half of the alley A; the paths of'the blades l! at the outside partially overhanging the gutters" 1, while the paths of the blades l! at the inside -lap each other, whereby no unscraped portion of the alley remains after passage of the machine.

In order to prevent the blades [1 of the separate With the described machine it is possible to impart a very excellent finish to the surface of a bowling alley, while at the same time maintaining the necessary accurate level of such alley.

A suction hood 48 overhangs the rotary scrapers H and approaches the sanding drum 4|, to the end that scrapings or sanding dust may be prevented from blowing about. The suction hood 42} is connected to a suction pipe 49 which leads to a suction fan 50" direct-connected to the electric motor 36. The suction fan 5!! is adapted to discharge into a receiving bag (not shown).

While the herein described machine is adapted primarily'for finishing bowling alleys, the machine may be put to advantageous use for surfacing and finishing wooden floors generally. In this event it is preferable that the flanged wheels 4 and 5 be substituted by fiat-faced wheels.

From the foregoing description it will be readily seen that there has been produced such a device as substantially fulfills'the objects of the invention, as set forth herein.

While this specification sets forthin detail-the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claim. 1

Having thus described the invention, the following isclaimed as new and useful, and upon which Letters Patent are desired:

A spinner for a. floor finishing machine comprising a hub, a vertical spindle upstanding from the hub, spider legs projectingradially of the hub,

a peripheral band supported about the outer ends of the spider legs, certain of the legs being provided with radially disposed slots opening down- .wardly and the inner end of each slot terminating in a socket formed in the leg, a blade fitting in each slot, the blade being provided with a projection at its inner end fitting in the adjacent socket, and a set screw projecting diagonally through the band into engagement with each blade.

GIOVANNI PAROVEL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 445,896 Kinsman Feb. 23,1891 895,497 Pliske Aug. 11, 1903 756,780 Dreger Apr. 5, 1904 948,174 Jacobs et al. Feb. 1, 1910 1,021,497 Woodrufr Mar. 26, 1912 1,647,066 Westman Oct. 25, 1927 1,752,156 E'ndorf Mar. 25, 1930 2,411,544 Kehl Nov. 26, 1946 

